The 20” Configurable 2 Post Rack Shelf has a surface area of 20” x 17.375” (508 x 441 mm) and can be recessed/ extended in 1” increments. This cantilever shelf is made from 16 GA steel and has a weight capacity of 150 lbs (68 kgs), allowing it to support a wide variety of equipment. The 20” Configurable 2 Post Rack Shelf can be mounted up-side-down and has flanges that can be positioned up or down or be removed.